I think it’s totally normal. It’s just because your abs are not strong enough yet, so the rest of your body tends to compensate for it. It does the same for me, though maybe not as much as you said. But I think it’s still perfectly normal! Just keep going and one day you’ll notice that you arch less. Also, I think everyone has a space between the floor and their back when they’re lying, depending on your butt’s form :)
HOW TO MAKE IT: Preheat oven to 350 degrees. Cut a 1 pound, small spaghetti squash in half and scoop out the seeds with a spoon. Place in an oven-safe baking dish, flesh-side up, and pour about 2 tablespoons of water into each half. Cover with aluminum foil and bake for 50 minutes to an hour, or until tender. In the meantime, pour a serving of marinara sauce into a small saucepan along with 6 of the mini meatballs to begin to heat up and defrost. Cover. Once the squash is done, pour out the water and use a fork to scrape long, spaghetti-like strands from the flesh onto your plate. Save the other half of the squash for lunch tomorrow.
Not only does drinking water prevent you from misinterpreting thirst signals as hunger, but contrary to popular belief, it actually can reduce water weight. Staying well hydrated will help you digest and flush out the sodium holding water in, giving you a flatter belly. “A lot of people refrain from drinking more water if they’re bloated, but you actually do want to continue drinking more water throughout the day,” says Armul. “It helps restore fluid balance.” Here are more things experts wish you knew about water weight.

If you find regular water too boring, consider making sassy water instead. Sassy water is simply regular water infused with a number of refreshing and energizing ingredients, which help to speed up the metabolism and cut down on belly fat. Recipes vary, but many include some combination of ingredients such as orange slices, lemon slices, grated ginger, cucumber, fresh spearmint, and fresh basil. The water is left to infuse overnight — making it refreshingly "sassy" by the next morning!
WHAT'S GOING ON: If the only abs exercise you ever do is crunches, you'll never have a firm tummy, says Stephanie Hahn, a physical therapist at STAR Physical Therapy in Austin, TX. Crunches train your rectus abdominis (your "six-pack") to fold forward. That makes the muscles shorter, and if your transverse abdominals (the muscles that sit behind your rectus) aren't toned, you end up with what experts call a muscle imbalance—and a bulge in your lower belly. "Doing more crunches won't help," Hahn says.
I posted nearly the exact same thing as you, it’s been a real problem for me and preventing me from completing the workout! But I’ve tried putting my hands behind my head and lifting my shoulders off the floor which helps as it is bending my back the other way, preventing it happening, although it makes it really hard! I’m not sure if that’s the correct thing to do, though, I hope we can get an answer!

Lie on the floor, face down, and support your upper body on your elbows, forearms, and hands. Slowly lift the rest of your body off the floor until you're on your toes. Keeping your body straight, hold for as long as is comfortable, then slowly lower and relax. Repeat as many times as possible until fatigued. For an added challenge, raise one leg at a time, as shown.

HOW TO MAKE IT: Combine piece of salmon, ¼ avocado, half a tomato, and a handful of frozen corn (which will thaw by lunchtime) with 2 cups of lettuce of your choice (we like romaine). Adding a handful of cheddar cheese or crushed tortilla chips is optional. To make the dressing, combine a cup of cilantro, a clove of garlic, the juice of 1 lime, a generous pinch of salt and pepper, 2 tablespoons of white vinegar and 3 tablespoons of extra virgin olive oil. Save half of the dressing for a salad later this week.
Dump the little pink weights. Build and shape muscle to improve the overall effectiveness of your workouts and to maintain a healthy metabolism. How much weight is enough? According to the American Council on Exercise, you should lift 70-80% of your maximum resistance to build and shape your muscles. Maximum resistance is usually defined as your “1 rep max” or the most weight you can lift in one repetition. For most people that means lifting more than the 2-3 pound little pink weights that you find in some fitness centers.
Curb bloating and slim your midsection the healthy way by making a few small changes. While it's impossible to target tummy fat directly, these tweaks may help you feel better (seeya, indigestion) without resorting to crazy (and dangerous) dieting techniques. And if your goal is to lose weight overall, eating more real, wholesome foods and getting active is always a smart way to go.
WHAT'S GOING ON: If the only abs exercise you ever do is crunches, you'll never have a firm tummy, says Stephanie Hahn, a physical therapist at STAR Physical Therapy in Austin, TX. Crunches train your rectus abdominis (your "six-pack") to fold forward. That makes the muscles shorter, and if your transverse abdominals (the muscles that sit behind your rectus) aren't toned, you end up with what experts call a muscle imbalance—and a bulge in your lower belly. "Doing more crunches won't help," Hahn says.
HOW TO MAKE IT: Reheat burger patty in a flat iron skillet on medium-high. On the other side of the pan, drop a tablespoon of grass-fed butter onto the skillet and warm up an English muffin until brown. Remove bun. After about 3 minutes, top turkey burger with a handful of cheddar cheese, pour a tablespoon of water onto the pan, and cover the pan with a lid. Once the cheese has melted, remove, place on top of the bun, and layer on a slice of tomato, avocado, and top off with some dijon mustard. Serve with a side salad of arugula (or lettuce of your choice) with a drizzle of balsamic vinegar and extra virgin olive oil.
That means Pink Lady over Granny Smith, watermelon over honeydew, red grapes over green ones. The higher levels of nutrients called flavonoids—particularly anthocyanins, compounds that give red fruits their color—calm the action of fat-storage genes. In fact, red-bellied stone fruits like plums boast phenolic compounds that have been shown to modulate the expression of fat genes. To learn more about turning on and off your fat genes, check out the essential list: 21 Nutrition Myths—Busted!

Keeping a bag of frozen fruit in your freezer makes it so easy to whip up this portable smoothie. Besides the convenience, frozen fruit can also be healthier than fresh fruit in the off-season because frozen fruit is picked at its peak and is full of free-radical-fighting antioxidants. What’s more, the act of freezing the fruit may also help release some of those antioxidants as the ice crystals can burst open the cells in which they’re stored! We like putting yogurt in our smoothies to add a little fat and protein and spinach to add fiber. And either a tablespoon of ground flaxseed or chia seeds for their anti-inflammatory omega-3s. All three will help to blunt any spike in blood sugar from the fruit (which also have their own source of fiber).

Chewing gum when you’re hungry fills your tummy with extra air, causing bloat. Many gums also contain sugar alcohols and artificial sweeteners, like sorbitol and xylitol, which can lead to bloating. Skip the gum altogether or opt for an organic variety like Glee gum or Simply gum instead. They’re still low-cal, but they don’t use sweeteners that’ll make you puff up.

Not only does drinking water prevent you from misinterpreting thirst signals as hunger, but contrary to popular belief, it actually can reduce water weight. Staying well hydrated will help you digest and flush out the sodium holding water in, giving you a flatter belly. “A lot of people refrain from drinking more water if they’re bloated, but you actually do want to continue drinking more water throughout the day,” says Armul. “It helps restore fluid balance.” Here are more things experts wish you knew about water weight.
The best part? Instead of cranking out dozens of crunches, we’re about to make-under your ab routine. For the first two weeks, do two to three circuits of the first four moves; together they hit all four ab muscle groups. “You’ll reach your goal faster if your workout builds on intensity and total reps done over time,” Olson explains. These moves get a little harder and the reps get higher for week three, plus there’s an exercise added in. Same for week four, except this time you’ll add two more moves to your session. By that week, expect two to three circuits of seven moves with the max challenge and reps. No sweat—you’ll be ready.

Day 3 of the ab challenge and feeling great! For anyone who is thinking of starting this, DO IT. I can already feel myself getting stronger in my core. Day 1, the leg lifts were awful, Day 3 they weren’t as bad. I see results so quickly and am very excited and motivated to continue! Good luck popsters! Btw- Dont forget the water part. It is so important and if you dont like water, add some lemon or fruit!

Carbohydrates hold water in your body, which may make your belly bloat. Plus, high-carb, high-sugar breakfast foods like bagels or cereal might fill you up initially, but you’ll probably end up searching for more food within an hour, says Alissa Rumsey, MS, RD, founder of Alissa Rumsey Nutrition and Wellness. “Those digest pretty rapidly, and then your blood sugar spikes up and drops back down pretty quickly because they digest so fast,” she says. That extra morning munching will likely add up to more calories and bloat than you would have had if you’d started with a more filling breakfast. Be sure to follow these other daily habits that reduce bloating and flatten your belly, too.

“Dance cardio really is an amazing way to trim belly fat because it is going to help shed fat on the body as a whole. It is obviously a cardio workout, but because your body is forced to move in all different directions in different planes, it is making every single muscle in your body work. Similar to the benefits of a HIIT workout, you get the cardio plus toning benefit all in one,” Hope explains. So try a dance-centric class at your gym or turn up your iPod and bust some moves at home.
When you’re continually stressed out, it’s bad news for your belly. Stress triggers the release of a hormone called cortisol, and because cortisol is evolutionarily linked to alerting your body to external dangers (like that buffalo headed straight for you) and low blood-glucose levels, it forces your body to store fat and makes you feel hungry. In other words, if you’re stressed, you’ll start craving that afternoon candy bar even if your stomach is actually full. To avoid stress, try simple things like yoga, taking deep breaths and meditating for a few minutes each day.

No matter what, do not miss that snack. It's important because it boosts metabolism and balances blood sugar. The lower you keep your blood sugar, the lower you keep your insulin, and insulin makes you store fat around your middle. Eating every three to four hours will keep your blood sugar even, but many people tend to go five or six hours between lunch and dinner without eating."

Not only does drinking water prevent you from misinterpreting thirst signals as hunger, but contrary to popular belief, it actually can reduce water weight. Staying well hydrated will help you digest and flush out the sodium holding water in, giving you a flatter belly. “A lot of people refrain from drinking more water if they’re bloated, but you actually do want to continue drinking more water throughout the day,” says Armul. “It helps restore fluid balance.” Here are more things experts wish you knew about water weight.
• Too much estrogen circulating in the body increases body fat, and fatty tissue within the body produces and stores more estrogen. Body fat contains an enzyme that converts adrenal steroids to estrogen. At a cellular level, body fat continues to produce more estrogen, and a high estrogen level, in turn, causes the body to increase its store of fatty tissue. In other words, your belly becomes a 'fat magnet.'
HOW TO MAKE IT: Take the oats out of the pot and pour into a resealable container. For this morning, combine a cup of oats, a teaspoon of cinnamon or pumpkin pie spice (includes nutmeg, cloves, and ginger), half a banana (sliced), about 5 chopped walnuts, and a quarter cup of almond milk, or your milk of choice. Place in the microwave for a minute, stir, and enjoy!

Stork tells Fox News he also get asked for advice quite a bit, but he thinks it's great that people are so interested in their health. "The one thing that I’ve learne,d and this is something that I found to be true since I started hosting “The Doctors,” is [that] we all want to be healthy … We don’t always succeed, but we’re all looking to be healthier and if people have questions for me … unless, like one time on a plane, a guy said, 'Hey doc, my hemorrhoids are really acting out!' No!"